
package org.owasp.webgoat.lessons.RoleBasedAccessControl;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.ecs.ElementContainer;
import org.owasp.webgoat.lessons.Category;
import org.owasp.webgoat.lessons.GoatHillsFinancial.DefaultLessonAction;
import org.owasp.webgoat.lessons.GoatHillsFinancial.FindProfile;
import org.owasp.webgoat.lessons.GoatHillsFinancial.GoatHillsFinancial;
import org.owasp.webgoat.lessons.GoatHillsFinancial.LessonAction;
import org.owasp.webgoat.lessons.GoatHillsFinancial.ListStaff;
import org.owasp.webgoat.lessons.GoatHillsFinancial.Login;
import org.owasp.webgoat.lessons.GoatHillsFinancial.Logout;
import org.owasp.webgoat.lessons.GoatHillsFinancial.SearchStaff;
import org.owasp.webgoat.session.ParameterNotFoundException;
import org.owasp.webgoat.session.UnauthenticatedException;
import org.owasp.webgoat.session.UnauthorizedException;
import org.owasp.webgoat.session.ValidationException;
import org.owasp.webgoat.session.WebSession;


/***************************************************************************************************
 * 
 * 
 * This file is part of WebGoat, an Open Web Application Security Project utility. For details,
 * please see http://www.owasp.org/
 * 
 * Copyright (c) 2002 - 2007 Bruce Mayhew
 * 
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with this program; if
 * not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 * 
 * Getting Source ==============
 * 
 * Source for this application is maintained at code.google.com, a repository for free software
 * projects.
 * 
 * For details, please see http://code.google.com/p/webgoat/
 */
public class RoleBasedAccessControl extends GoatHillsFinancial
{
	private final static Integer DEFAULT_RANKING = new Integer(125);

	public final static String STAGE1 = "Bypass Business Layer Access Control";

	public final static String STAGE2 = "Add Business Layer Access Control";

	public final static String STAGE3 = "Bypass Data Layer Access Control";

	public final static String STAGE4 = "Add Data Layer Access Control";

	protected void registerActions(String className)
	{
		registerAction(new ListStaff(this, className, LISTSTAFF_ACTION));
		registerAction(new SearchStaff(this, className, SEARCHSTAFF_ACTION));
		registerAction(new ViewProfile(this, className, VIEWPROFILE_ACTION));
		registerAction(new EditProfile(this, className, EDITPROFILE_ACTION));
		
		// This action has not yet been implemented. None of the lessons require it.
		registerAction(new EditProfile(this, className, CREATEPROFILE_ACTION));

		// These actions are special in that they chain to other actions.
		registerAction(new Login(this, className, LOGIN_ACTION, getAction(LISTSTAFF_ACTION)));
		registerAction(new Logout(this, className, LOGOUT_ACTION, getAction(LOGIN_ACTION)));
		registerAction(new FindProfile(this, className, FINDPROFILE_ACTION, getAction(VIEWPROFILE_ACTION)));
		registerAction(new UpdateProfile(this, className, UPDATEPROFILE_ACTION, getAction(VIEWPROFILE_ACTION)));
		registerAction(new DeleteProfile(this, className, DELETEPROFILE_ACTION, getAction(LISTSTAFF_ACTION)));
	}

	/**
	 * Gets the category attribute of the CommandInjection object
	 * 
	 * @return The category value
	 */
	public Category getDefaultCategory()
	{
		return Category.ACCESS_CONTROL;
	}

	/**
	 * Gets the hints attribute of the DirectoryScreen object
	 * 
	 * @return The hints value
	 */
	protected List<String> getHints(WebSession s)
	{
		List<String> hints = new ArrayList<String>();
		hints.add("Many sites attempt to restrict access to resources by role.");
		hints.add("Developers frequently make mistakes implementing this scheme.");
		hints.add("Attempt combinations of users, roles, and resources.");

		// Stage 1
		hints.add("Stage1: How does the application know that the user selected the delete function?");

		// Stage 2
		hints.add("Stage2: You have to code to check the authorization of the user for the action.");


		// Stage 3
		hints.add("Stage3: How does the application know that the user selected any particular employee to view?");

		// Stage 4
		hints.add("Note that the contents of the staff listing change depending on who is logged in.");

		hints
				.add("Stage4: You have to code to check the authorization of the user for the action on a certain employee.");

		return hints;
	}

	@Override
	public String[] getStages()
	{
		if (getWebgoatContext().isCodingExercises()) return new String[] { STAGE1, STAGE2, STAGE3, STAGE4 };
		return new String[] { STAGE1, STAGE3 };
	}

	/**
	 * Gets the instructions attribute of the ParameterInjection object
	 * 
	 * @return The instructions value
	 */
	public String getInstructions(WebSession s)
	{
		String instructions = "";

		if (!getLessonTracker(s).getCompleted())
		{
			String stage = getStage(s);
			if (STAGE1.equals(stage))
			{
				instructions = "Stage 1: Bypass Presentational Layer Access Control.<br />"
						+ "As regular employee 'Tom', exploit weak access control to use the Delete function from the Staff List page. "
						+ "Verify that Tom's profile can be deleted. "
						+ "The passwords for users are their given names in lowercase (e.g. the password for Tom Cat is \"tom\").";
			}
			else if (STAGE2.equals(stage))
			{
				instructions = "Stage 2: Add Business Layer Access Control.<br><br />"
						+ "<b><font color=\"blue\"> THIS LESSON ONLY WORKS WITH THE DEVELOPER VERSION OF WEBGOAT</font></b><br /><br />"
						+ "Implement a fix to deny unauthorized access to the Delete function. "
						+ "To do this, you will have to alter the WebGoat code. "
						+ "Once you have done this, repeat stage 1 and verify that access to DeleteProfile functionality is properly denied.";
			}
			else if (STAGE3.equals(stage))
			{
				instructions = "Stage 3: Breaking Data Layer Access Control.<br />"
						+ "As regular employee 'Tom', exploit weak access control to View another employee's profile. Verify the access.";
			}
			else if (STAGE4.equals(stage))
			{
				instructions = "Stage 4: Add Data Layer Access Control.<br><br />"
						+ "<b><font color=\"blue\"> THIS LESSON ONLY WORKS WITH THE DEVELOPER VERSION OF WEBGOAT</font></b><br /><br />"
						+ "Implement a fix to deny unauthorized access to this data. "
						+ "Once you have done this, repeat stage 3, and verify that access to other employee's profiles is properly denied.";
			}
		}

		return instructions;
	}

	public String getLessonSolutionFileName(WebSession s)
	{
		String solutionFileName = null;
		String stage = getStage(s);
		solutionFileName = "/lesson_solutions/Lab Access Control/Lab " + stage + ".html";
		return solutionFileName;
	}

	@Override
	public String getSolution(WebSession s)
	{
		String src = null;

		try
		{
			src = readFromFile(new BufferedReader(new FileReader(s.getWebResource(getLessonSolutionFileName(s)))),
								false);
		} catch (IOException e)
		{
			s.setMessage("Could not find the solution file");
			src = ("Could not find the solution file");
		}
		return src;
	}

	public void handleRequest(WebSession s)
	{
		// Here is where dispatching to the various action handlers happens.
		// It would be a good place verify authorization to use an action.

		// System.out.println("RoleBasedAccessControl.handleRequest()");
		if (s.getLessonSession(this) == null) s.openLessonSession(this);

		String requestedActionName = null;
		try
		{
			requestedActionName = s.getParser().getStringParameter("action");
		} catch (ParameterNotFoundException pnfe)
		{
			// Let them eat login page.
			requestedActionName = LOGIN_ACTION;
		}
		// System.out.println("Requested lesson action: " + requestedActionName);

		try
		{
			DefaultLessonAction action = (DefaultLessonAction) getAction(requestedActionName);
			if (action != null)
			{
				// System.out.println("RoleBasedAccessControl.handleRequest() dispatching to: " +
				// action.getActionName());
				if (!action.requiresAuthentication())
				{
					// Access to Login does not require authentication.
					action.handleRequest(s);
				}
				else
				{
					// ***************CODE HERE*************************

					// *************************************************
					if (action.isAuthenticated(s))
					{
						action.handleRequest(s);
					}
					else
						throw new UnauthenticatedException();
				}
			}
			else
				setCurrentAction(s, ERROR_ACTION);
		} catch (ParameterNotFoundException pnfe)
		{
			// System.out.println("Missing parameter");
			pnfe.printStackTrace();
			setCurrentAction(s, ERROR_ACTION);
		} catch (ValidationException ve)
		{
			// System.out.println("Validation failed");
			ve.printStackTrace();
			setCurrentAction(s, ERROR_ACTION);
		} catch (UnauthenticatedException ue)
		{
			s.setMessage("Login failed");
			// System.out.println("Authentication failure");
			ue.printStackTrace();
		} catch (UnauthorizedException ue2)
		{
			s.setMessage("You are not authorized to perform this function");

			// Update lesson status if necessary.
			String stage = getStage(s);
			if (STAGE2.equals(stage))
			{
				try
				{
					if (RoleBasedAccessControl.DELETEPROFILE_ACTION.equals(requestedActionName)
							&& !isAuthorized(s, getUserId(s), RoleBasedAccessControl.DELETEPROFILE_ACTION))
					{
						setStageComplete(s, STAGE2);
					}
				} catch (ParameterNotFoundException pnfe)
				{
					pnfe.printStackTrace();
				}
			}
			// System.out.println("isAuthorized() exit stage: " + getStage(s));
			// Update lesson status if necessary.
			if (STAGE4.equals(stage))
			{
				try
				{
					// System.out.println("Checking for stage 4 completion");
					DefaultLessonAction action = (DefaultLessonAction) getAction(getCurrentAction(s));
					int userId = Integer.parseInt((String) s.getRequest().getSession()
							.getAttribute(getLessonName() + "." + RoleBasedAccessControl.USER_ID));
					int employeeId = s.getParser().getIntParameter(RoleBasedAccessControl.EMPLOYEE_ID);

					if (!action.isAuthorizedForEmployee(s, userId, employeeId))
					{
						setStageComplete(s, STAGE4);
					}
				} catch (Exception e)
				{
					// swallow this - shouldn't happen inthe normal course
					// e.printStackTrace();
				}
			}

			// System.out.println("Authorization failure");
			setCurrentAction(s, ERROR_ACTION);
			ue2.printStackTrace();
		} catch (Exception e)
		{
			// All other errors send the user to the generic error page
			// System.out.println("handleRequest() error");
			e.printStackTrace();
			setCurrentAction(s, ERROR_ACTION);
		}

		// All this does for this lesson is ensure that a non-null content exists.
		setContent(new ElementContainer());
	}

	public void handleRequest_BACKUP(WebSession s)
	{
		// Here is where dispatching to the various action handlers happens.
		// It would be a good place verify authorization to use an action.

		// System.out.println("RoleBasedAccessControl.handleRequest()");
		if (s.getLessonSession(this) == null) s.openLessonSession(this);

		String requestedActionName = null;
		try
		{
			requestedActionName = s.getParser().getStringParameter("action");
		} catch (ParameterNotFoundException pnfe)
		{
			// Let them eat login page.
			requestedActionName = LOGIN_ACTION;
		}
		// System.out.println("Requested lesson action: " + requestedActionName);

		if (requestedActionName != null)
		{
			try
			{
				LessonAction action = getAction(requestedActionName);
				if (action != null)
				{
					// System.out.println("RoleBasedAccessControl.handleRequest() dispatching to: "
					// + action.getActionName());
					if (!action.requiresAuthentication())
					{
						// Access to Login does not require authentication.
						action.handleRequest(s);
					}
					else
					{
						if (action.isAuthenticated(s))
						{
							int userId = action.getUserId(s);
							if (action.isAuthorized(s, userId, action.getActionName()))
							{
								action.handleRequest(s);
							}
							else
							{
								throw new UnauthorizedException();
							}
						}
						else
							throw new UnauthenticatedException();
					}
				}
				else
					setCurrentAction(s, ERROR_ACTION);
			} catch (ParameterNotFoundException pnfe)
			{
				// System.out.println("Missing parameter");
				pnfe.printStackTrace();
				setCurrentAction(s, ERROR_ACTION);
			} catch (ValidationException ve)
			{
				// System.out.println("Validation failed");
				ve.printStackTrace();
				setCurrentAction(s, ERROR_ACTION);
			} catch (UnauthenticatedException ue)
			{
				s.setMessage("Login failed");
				// System.out.println("Authentication failure");
				ue.printStackTrace();
			} catch (UnauthorizedException ue2)
			{
				String stage = getStage(s);
				// Update lesson status if necessary.
				if (STAGE2.equals(stage))
				{
					try
					{
						if (RoleBasedAccessControl.DELETEPROFILE_ACTION.equals(requestedActionName)
								&& !isAuthorized(s, getUserId(s), RoleBasedAccessControl.DELETEPROFILE_ACTION))
						{
							setStageComplete(s, STAGE2);
						}
					} catch (ParameterNotFoundException pnfe)
					{
						pnfe.printStackTrace();
					}
				}
				// System.out.println("isAuthorized() exit stage: " + getStage(s));
				// Update lesson status if necessary.
				if (STAGE4.equals(stage))
				{
					try
					{
						// System.out.println("Checking for stage 4 completion");
						DefaultLessonAction action = (DefaultLessonAction) getAction(getCurrentAction(s));
						int userId = Integer.parseInt((String) s.getRequest().getSession()
								.getAttribute(getLessonName() + "." + RoleBasedAccessControl.USER_ID));
						int employeeId = s.getParser().getIntParameter(RoleBasedAccessControl.EMPLOYEE_ID);

						if (!action.isAuthorizedForEmployee(s, userId, employeeId))
						{
							setStageComplete(s, STAGE4);
						}
					} catch (Exception e)
					{
						// swallow this - shouldn't happen inthe normal course
						// e.printStackTrace();
					}
				}

				s.setMessage("You are not authorized to perform this function");
				// System.out.println("Authorization failure");
				setCurrentAction(s, ERROR_ACTION);
				ue2.printStackTrace();
			} catch (Exception e)
			{
				// All other errors send the user to the generic error page
				// System.out.println("handleRequest() error");
				e.printStackTrace();
				setCurrentAction(s, ERROR_ACTION);
			}
		}

		// All this does for this lesson is ensure that a non-null content exists.
		setContent(new ElementContainer());
	}

	protected Integer getDefaultRanking()
	{
		return DEFAULT_RANKING;
	}

	/**
	 * Gets the title attribute of the DirectoryScreen object
	 * 
	 * @return The title value
	 */
	public String getTitle()
	{
		return "LAB: Role Based Access Control";
	}
}
